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Carcass Rendering Systems for Farm Mortalities: a Review

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Carcass Rendering Systems for Farm Mortalities: a Review 199 Carcass rendering systems for farm mortalities: A review A. Kalbasi-Ashtari, M.M. Schutz, and B.W. Auvermann Abstract: Improper animal-mortality disposal may allow pathogenic microorganisms to spread diseases in soil, plants, ani- mals, and to humans; and resulting odor reduces the quality of life for neighbors. Health hazards posed by neglect in car- cass disposal would be pronounced in the event of a natural catastrophe, disease outbreak or intentional depopulation of herds or flocks. Conventional rendering systems have been utilized for the last two decades to convert various animal car- casses to different products. However, considerations regarding prion diseases will further shape the rendering industry. New rendering technologies that convert suspected prion-infected animal tissues into tallow and protein for use as a bio- fuel and fertilizer, respectively, are beginning to emerge. This paper reviews the rendering industry and new methods for carcass rendering to produce safe and economically valuable products while minimizing impacts on public safety and envi- ronmental quality. Key words: rendering, carcass disposal, meat and bone meal, animal mortality, prion disease, livestock. Re´sume´ : La disposition inade´quate d’animaux morts peut permettre a` des microorganismes pathoge`nes de propager des maladies dans le sol, aux plantes, aux animaux et aux humains; de plus, les odeurs qui en re´sultent re´duisent la qualite´ de vie des voisins. Les dangers pour la sante´ pose´s par l’e´limination ne´gligente de carcasses pourraient eˆtre accentue´s en cas de catastrophe naturelle, d’e´pide´mie ou de re´duction intentionnelle des cheptels de be´tail ou des bandes de volailles. Les syste`mes d’e´quarrissage conventionnels ont e´te´ utilise´s au cours des deux dernie`res de´cennies pour convertir les carcasses de divers animaux en diffe´rents produits. Toutefois, les dangers concernant les maladies a` prions affecteront encore plus l’industrie de l’e´quarrissage. De nouvelles techniques d’e´quarrissage qui convertissent les tissus d’animaux suspecte´s d’eˆtre infecte´s aux prions en suif et en prote´ines pour utilisation respective dans les biocarburants et les fertilizants commencent a` e´merger. Cet article analyse l’industrie de l’e´quarrissage ainsi que les nouvelles me´thodes d’e´quarrissage des carcasses dans le but de ge´ne´rer des produits de manie`re se´curitaire et e´conomique tout en minimizant les impacts sur la se´curite´ du public et la qualite´ de l’environnement. Mots-cle´s:e´quarrissage, e´limination des carcasses, farine d’animaux d’e´quarrissage, mortalite´ animale, maladie a` prions, be´tail. [Traduit par la Re´daction] Introduction ians, and pharmaceutical companies, millions of livestock and poultry perish because of diseases or accidents prevent- One of the largest agricultural businesses in the United ing human consumption. While more than 439 million States is the combined livestock and poultry industry. More chickens (excluding commercial broilers) and 264 million than 54 billion lb (~24 billion kg) of poultry meat turkeys were raised for commercial sale in the United States (46 broilers + 1 chicken + 7 turkey) and 45 billion lb in 2004, more than 34% (about 101 million) of chickens and (~20 billion kg) of red meat (cattle, calves, sheep, hogs, and more than 10% (about 26 million) of turkeys died from dis- goats) were produced during 2004 (US Department of Agri- eases, natural causes, or from other reasons such as natural culture, Economics and Statistics Systems 2005). Yet every disasters before they were marketable (US Department of year, despite the best attempts of farm managers, veterinar- Agriculture, Economics and Statistics Systems 2005). Received 16 November 2006. Revision accepted 3 December Ruminant mortalities (cattle, sheep, lamb, and goats) in 2007. Published on the NRC Research Press Web site at the US have a similar situation and out of 95 billion head jees.nrc.ca on 27 March 2008. of all cattle and calves raised in the US, more than 20% were lost prior to slaughter during 2004 (US Department of A. Kalbasi-Ashtari. Food Technology Engineering Department Agriculture, Economics and Statistics Systems 2005). In at Tehran University, Karaj, Iran. M. Schutz.1 Department of Animal Sciences, Purdue University, 2004, Hurricane Ivan caused considerable damage in the 125 South Russell, #105, West Lafayette, IN 47907, USA. northern counties of Georgia and a single farm in Gilmer B. Auvermann. Biological and Agricultural Engineering County lost 96 000 chickens and 19 dairy cows (Georgia Department at Texas AM University, Amarillo, Texas, USA. Department of Agriculture 2005). Written discussion of this article is welcomed and will be Infectious and non-infectious diseases cause heavy losses received by the Editor until 30 September 2008. of animal populations worldwide every year (Texas Depart- ment of Agriculture 2002). In addition to economic conse- 1Corresponding author (e-mail: [email protected]). quences, catastrophic mortality losses may threaten the J. Environ. Eng. Sci. 7: 199–211 (2008) doi:10.1139/S07-051 # 2008 NRC Canada 200 J. Environ. Eng. Sci. Vol. 7, 2008 public health and environment in the wake of natural disas- cass materials (with complex or simple mixtures of proteins, ters. minerals, and fatty substances) to liquefy the fat and break To prevent these undesirable impacts, government agen- down membranes or other structures that may hold the fat cies around the world have established strict rules and stand- (Romans et al. 2001). Modern carcass rendering is a process ards for dead animal disposal. For example, in Ontario, of using high temperature and pressure to convert a variety Canada, livestock producers must dispose of dead animals of highly perishable protein and fat materials including con- within 48 h of death (Ontario Ministry of Food and Agricul- demned, fallen, culled, and experimental animals with little ture 2001). In Minnesota, Texas, and Indiana, dead animal or no value into safe, nutritional, and economically valuable carcasses must be properly disposed of within 24 h of death products (Prokop 1996; Romans et al. 2001). (Morse 2001; Texas Natural Resources Conservation Service Generally, the rendering process is accomplished by re- and Texas State Soil and Water Conservation Board 2002; ceiving raw materials followed by removing undesirable Indiana State Board of Animal Health 2002). parts, cutting, mixing, sometimes preheating, cooking, and At the beginning of the 20th century, the rendering system separating fat and protein materials. Then the concentrated emerged initially for animal byproduct feed sources and sec- protein is dried and ground. Further refining of gases, odors, ondly for carcass conversion. Besides animal protein and tal- and wastewater (generated by the cooking process) is also low production, the North American rendering industry has required in most cases. played a major role in conversion of perishable livestock ma- Rendering plants that employ ‘‘inedible rendering’’ proc- terials of different species into valuable ingredients for man- esses convert the fat, protein, and keratin (hoof and horn) ufacturing soaps, paints and varnishes, cosmetics, explosives, materials found in dead carcasses into inedible tallow, car- toothpaste, pharmaceuticals, leather, textiles, and lubricants cass meal, and fertilizer, respectively. In these plants the and, more importantly, maintaining a clean environment. In rendering process is accomplished by receiving raw materi- 2005, the US rendering industry produced about 1.65 million als followed by removing undesirable materials (such as fer- tons of inedible tallow, usually produced from farm animal rous metals) by passing through metal detectors or carcass mortalities (National Renderers Association, Inc. 2006). A parts by cutting, mixing, sometimes preheating, cooking, vast number of nutrient-rich and flavorful ingredients that re- and separating fat and protein materials. The hide is not usu- sult from the rendering process serve not only livestock and ally removed from hogs and small animals, but the hair of poultry production, but also the pet food industry for rations such animals should have been removed before washing that maintain healthy companion animals. and cleaning. After preparation processes, the following processes will occur under a conventional rendering system: The number of US rendering plants declined from 990 in 1978 to approximately 331 in 1992 (Singeltary 2000). The . Under atmospheric pressure, ground carcass material en- decline of roughly 50 operations per year was attributed to tering the cookers with maximum particle size of 40 mm, several factors, including changes in technology, greater use is heated up to the maximum temperature range of 120– of less expensive plant proteins to replace animal proteins in 140 8C (248–284 8F) for the average cooking time of animal rations, emergence of knowledge about resistant pro- about 3.5 h (Expert Group on Animal Feeding Stuffs teins (prions) in rendering products, and changes in slaugh- 1996). ter industry practices. On the other hand, the older and more . In some plants the load is discharged once the maximum resource intensive batch-rendering processes were quickly temperature is reached; in others there may be a holding being replaced by more efficient continuous-processing tech- time of up to 20 min. nologies. The new, more efficient, larger continuous render- . On discharge, the ‘‘free-run’’ fat is drained off; and the ing
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